Gray nails are a common fungal disease caused by a fungus that infects the nail plate and the tissues under the nail. FIGA is a skin antiseptic and its active ingredient is benzalkonium chloride, which is generally not used for antifungal treatment of gray nails. If a patient applies FIGA topically on the surface of the nail alone, it will not be able to penetrate through the thick diseased nail to kill the fungus. Patients who have gray nails should go to the dermatology department of a regular tertiary hospital for regular antifungal treatment. Currently in the clinic, many drugs have really effective efficacy in removing the fungus of gray nails, and also in the guidelines as well as the clinic has been effectively verified. Commonly used topical medications, like cyclopirox, amorolfine, and tincture of iodine are generally available.